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首页> 外文期刊>Journal of genetics >Genetic analysis of maydis leaf blight resistance in subtropical maize (Zea mays L.) germplasm
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Genetic analysis of maydis leaf blight resistance in subtropical maize (Zea mays L.) germplasm

机译：亚热带玉米（Zea mays L.）种质中芥菜叶枯病抗性的遗传分析

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摘要

Knowledge on the genetics of maydis leaf blight (MLB) is crucial to breed the resistant maize cultivars to combat disease epidemics as a sustainable and cost-effective approach. The present investigation was framed to understand the genetics of MLB resistance in subtropical maize. Two contrasting genotypes CM119 (susceptible) and SC-7-2-1-2-6-1 (resistant) were used to generate six genetic populations, namely P-1, P-2, F-1, F-2, BC1P1 and BC1P2, and evaluated in three target environments for MLB resistance under artificial epiphytotic condition. The CM119 and SC-7-2-1-2-6-1 showed susceptible and resistant reactions with mean disease reaction of 3.89-3.98 and 1.88-2.00, respectively. The derived generations, namely F-1, F-2, BC1P1 and BC1P2 showed mean disease reaction of 2.15-2.28, 2.44-2.51, 2.19-2.24 and 2.22-2.28, respectively in the test locations. The segregating generations (F-2: 0.35-0.37; BC1P1: 0.24-0.29 and BC1P2: 0.17-0.20) showed variation for MLB disease resistance over the parental and first filial generations (P-1: 0.11-0.17; P-2: 0.08-0.13 and F-1: 0.12-0.14). The genetic analysis of MLB resistance revealed the nonallelic interactions of duplicate epistasis type across the test locations. Among the gene interactions, dominance x dominance [l] effect was predominant over additive x additive [i] and additive x dominance [j] effects. The segregation analysis and the prediction of the number of major loci revealed at least two major genes associated with MLB tolerance in subtropical maize. Our investigation paved the foundation for the improvement of subtropical maize germplasm of MLB resistance.
机译：了解玉米叶枯病（MLB）的遗传学知识对于培育抗病玉米品种以对抗疾病流行至关重要，这是一种可持续且成本效益高的方法。本研究旨在了解亚热带玉米MLB抗性的遗传学。利用两个对比基因型CM119（易感）和SC-7-2-1-2-6-1（抗性）产生六个遗传群体，即P-1、P-2、F-1、F-2、BC1P1和BC1P2，并在三个目标环境中评估人工附生条件下的MLB抗性。CM119和SC-7-2-1-2-6-1表现出敏感性和抗性反应，平均疾病反应分别为3.89-3.98和1.88-2.00。衍生世代，即F-1、F-2、BC1P1和BC1P2在试验地点的平均疾病反应分别为2.15-2.28、2.44-2.51、2.19-2.24和2.22-2.28。分离世代（F-2:0.35-0.37；BC1P1:0.24-0.29和BC1P2:0.17-0.20）的MLB抗病性在亲本和第一子代（P-1:0.11-0.17；P-2:0.08-0.13和F-1:0.12-0.14）之间存在差异。MLB抗性的遗传分析显示，在试验地点存在重复上位性类型的非等位基因互作。在基因互作中，显性x显性[l]效应优于加性x加性[i]和加性x显性[j]效应。分离分析和主基因座数量预测显示，亚热带玉米中至少有两个主基因与MLB耐性相关。本研究为提高亚热带玉米抗MLB种质资源奠定了基础。

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